Tayyip Erdogan has described his third term as Turkish prime minister as that of a "master", borrowing from the celebrated Ottoman architect Sinan and the last stage of his storied career after apprenticeship and graduation.

It's a lofty allusion.

Sinan's 16th-century creations came to define the Ottoman Empire at its apogee, the Suleymaniye Mosque, built for Sultan Suleiman, part of Istanbul's unmistakable skyline.

Now, entering a second decade at the helm of a country revelling in its regional might, Erdogan wants to leave his own mark on the cityscape with what will be Turkey's biggest mosque, a "giant mosque," he says, "that will be visible from all across Istanbul."